Search by image is a feature that makes use of “Reverse Image Search” which lets people to search for similar images simply by uploading an image using the ‘browse’ button or inserting the image URL. Search Engines Like Google, Bing, Yandex achieve this by evaluating the submitted picture and creating a calculated model of it using advanced procedures. It is then matched with numerous of other photos or images in Google, Bing or Yandex databases before returning matching and providing you with similar results. It should then be noted that whenever available, Google also makes use of meta-data about the image such as description.